CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) - USD ($) shares in Millions, $ in Millions | Total | Conversion of series A preferred stock upon sales into public market | Conversion of class C common stock upon sales into public market | Cumulative Effect, Period of Adoption, Adjustment | Series B preferred stock | Series C preferred stock | Class A common stock | Preferred Stock | Preferred Stock Conversion of series A preferred stock upon sales into public market | Preferred Stock Series A preferred stock | [1] | Preferred Stock Series A preferred stock Conversion of series A preferred stock upon sales into public market | [1] | Preferred Stock Series B preferred stock | Preferred Stock Series C preferred stock | Common Stock Class A common stock | Common Stock Class A common stock Conversion of series A preferred stock upon sales into public market | Common Stock Class A common stock Conversion of class C common stock upon sales into public market | Common Stock Class B common stock | Common Stock Class C common stock | Common Stock Class C common stock Conversion of class C common stock upon sales into public market | Right to Recover for Covered Losses | Additional Paid-In Capital | Additional Paid-In Capital Conversion of series A preferred stock upon sales into public market | Accumulated Income | Accumulated Income Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss), Net |
Beginning balance (in shares) at Sep. 30, 2020 | | | | | | | | | | | 0 | | 2 | 3 | 1,683 | | | | 245 | 11 | | | | | | | | |
Beginning balance at Sep. 30, 2020 | | $ 36,210 | | | $ 3 | | | | $ 5,086 | | | | $ 1,106 | $ 1,543 | | | | | | | | | $ (39) | $ 16,721 | | $ 14,088 | $ 3 | $ 354 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Net income | | 8,727 | | | | | | | | | | | | | | | | | | | | | | | | 8,727 | | |
Other comprehensive income (loss), net of tax | | 247 | | | | | | | | | | | | | | | | | | | | | | | | | | 247 |
Comprehensive income | | 8,974 | | | | | | | | | | | | | | | | | | | | | | | | | | |
VE territory covered losses incurred | | (38) | | | | | | | | | | | 0 | 0 | | | | | | | | | (38) | | | | | |
Recovery through conversion rate adjustment | | (2) | | | | $ 35 | $ 20 | | (55) | | | | $ (35) | $ (20) | | | | | | | | | 53 | | | | | |
Conversion of stock (for Series A Preferred Stock, less than one million shares) (in shares) | | | | | | | | | | | | 0 | | | | 28 | | 2 | | | (1) | | | | | | | |
Conversion of stock (for Series A Preferred Stock, less than one million shares) | | | $ 0 | $ 0 | | | | | | $ (1,899) | | | | | | | | | | | | | | | $ 1,899 | | | |
Share-based compensation, net of forfeitures | | 434 | | | | | | | | | | | | | | | | | | | | | | 434 | | | | |
Vesting of restricted stock and performance-based shares (in shares) | | | | | | | | | | | | | | | 3 | | | | | | | | | | | | | |
Vesting of restricted stock and performance-based shares | | 0 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Restricted stock and performance-based shares settled in cash for taxes (in shares) | | | | | | | | | | | | | | | (1) | | | | | | | | | | | | | |
Restricted stock and performance-based shares settled in cash for taxes | | (142) | | | | | | | | | | | | | | | | | | | | | | (142) | | | | |
Cash proceeds from issuance of class A common stock under employee equity plans (in shares) | | | | | | | | | | | | | | | 1 | | | | | | | | | | | | | |
Cash proceeds from issuance of class A common stock under employee equity plans | | 162 | | | | | | | | | | | | | | | | | | | | | | 162 | | | | |
Cash dividends declared and paid, at a quarterly amount per class A common stock | | (2,102) | | | | | | | | | | | | | | | | | | | | | | | | (2,102) | | |
Repurchase of class A common stock (in shares) | | | | | | | | (27) | | | | | | | (27) | | | | | | | | | | | | | |
Repurchase of class A common stock | | (5,709) | | | | | | $ (5,709) | | | | | | | | | | | | | | | | (287) | | (5,422) | | |
Ending balance (in shares) at Jun. 30, 2021 | | | | | | | | | | | 0 | | 2 | 3 | 1,689 | | | | 245 | 10 | | | | | | | | |
Ending balance at Jun. 30, 2021 | | 37,790 | | | | | | | 3,132 | | | | $ 1,071 | $ 1,523 | | | | | | | | | (24) | 18,787 | | 15,294 | | 601 |
Beginning balance (in shares) at Mar. 31, 2021 | | | | | | | | | | | 0 | | 2 | 3 | 1,694 | | | | 245 | 11 | | | | | | | | |
Beginning balance at Mar. 31, 2021 | | 37,696 | | | | | | | 3,347 | | | | | | | | | | | | | | (41) | 18,505 | | 15,513 | | 372 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Net income | | 2,575 | | | | | | | | | | | | | | | | | | | | | | | | 2,575 | | |
Other comprehensive income (loss), net of tax | | 229 | | | | | | | | | | | | | | | | | | | | | | | | | | 229 |
Comprehensive income | | 2,804 | | | | | | | | | | | | | | | | | | | | | | | | | | |
VE territory covered losses incurred | | (21) | | | | | | | | | | | | | | | | | | | | | (21) | | | | | |
Recovery through conversion rate adjustment | | (2) | | | | | | | (40) | | | | | | | | | | | | | | 38 | | | | | |
Conversion of stock (for Series A Preferred Stock, less than one million shares) (in shares) | | | | | | | | | | | | 0 | | | | 3 | | 2 | | | (1) | | | | | | | |
Conversion of stock (for Series A Preferred Stock, less than one million shares) | | | 0 | 0 | | | | | | (175) | | | | | | | | | | | | | | | 175 | | | |
Share-based compensation, net of forfeitures | | 159 | | | | | | | | | | | | | | | | | | | | | | 159 | | | | |
Vesting of restricted stock and performance-based shares (in shares) | [1] | | | | | | | | | | | | | | 0 | | | | | | | | | | | | | |
Vesting of restricted stock and performance-based shares | | 0 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Restricted stock and performance-based shares settled in cash for taxes (in shares) | [1] | | | | | | | | | | | | | | 0 | | | | | | | | | | | | | |
Restricted stock and performance-based shares settled in cash for taxes | | (2) | | | | | | | | | | | | | | | | | | | | | | (2) | | | | |
Cash proceeds from issuance of class A common stock under employee equity plans (in shares) | [1] | | | | | | | | | | | | | | 0 | | | | | | | | | | | | | |
Cash proceeds from issuance of class A common stock under employee equity plans | | 54 | | | | | | | | | | | | | | | | | | | | | | 54 | | | | |
Cash dividends declared and paid, at a quarterly amount per class A common stock | | (698) | | | | | | | | | | | | | | | | | | | | | | | | (698) | | |
Repurchase of class A common stock (in shares) | | | | | | | | (10) | | | | | | | (10) | | | | | | | | | | | | | |
Repurchase of class A common stock | | (2,200) | | | | | | $ (2,200) | | | | | | | | | | | | | | | | (104) | | (2,096) | | |
Ending balance (in shares) at Jun. 30, 2021 | | | | | | | | | | | 0 | | 2 | 3 | 1,689 | | | | 245 | 10 | | | | | | | | |
Ending balance at Jun. 30, 2021 | | 37,790 | | | | | | | 3,132 | | | | $ 1,071 | $ 1,523 | | | | | | | | | (24) | 18,787 | | 15,294 | | 601 |
Beginning balance (in shares) at Sep. 30, 2021 | | | | | | | | | | | 0 | | 2 | 3 | 1,677 | | | | 245 | 10 | | | | | | | | |
Beginning balance at Sep. 30, 2021 | | 37,589 | | | | | | | 3,080 | | | | $ 1,071 | $ 1,523 | | | | | | | | | (133) | 18,855 | | 15,351 | | 436 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Net income | | 11,017 | | | | | | | | | | | | | | | | | | | | | | | | 11,017 | | |
Other comprehensive income (loss), net of tax | | (1,703) | | | | | | | | | | | | | | | | | | | | | | | | | | (1,703) |
Comprehensive income | | 9,314 | | | | | | | | | | | | | | | | | | | | | | | | | | |
VE territory covered losses incurred | | (31) | | | | | | | | | | | 0 | 0 | | | | | | | | | (31) | | | | | |
Recovery through conversion rate adjustment | | 0 | | | | $ 135 | $ 6 | | (141) | | | | $ (135) | $ (6) | | | | | | | | | 141 | | | | | |
Conversion of stock (for Series A Preferred Stock, less than one million shares) (in shares) | | | | | | | | | | | | 0 | | | | 1 | | 1 | | | 0 | [1] | | | | | | |
Conversion of stock (for Series A Preferred Stock, less than one million shares) | | | 0 | 0 | | | | | | (88) | | | | | | | | | | | | | | | 88 | | | |
Share-based compensation, net of forfeitures | | 470 | | | | | | | | | | | | | | | | | | | | | | 470 | | | | |
Vesting of restricted stock and performance-based shares (in shares) | | | | | | | | | | | | | | | 2 | | | | | | | | | | | | | |
Vesting of restricted stock and performance-based shares | | 0 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Restricted stock and performance-based shares settled in cash for taxes (in shares) | [1] | | | | | | | | | | | | | | 0 | | | | | | | | | | | | | |
Restricted stock and performance-based shares settled in cash for taxes | | (117) | | | | | | | | | | | | | | | | | | | | | | (117) | | | | |
Cash proceeds from issuance of class A common stock under employee equity plans (in shares) | | | | | | | | | | | | | | | 2 | | | | | | | | | | | | | |
Cash proceeds from issuance of class A common stock under employee equity plans | | 153 | | | | | | | | | | | | | | | | | | | | | | 153 | | | | |
Cash dividends declared and paid, at a quarterly amount per class A common stock | | (2,409) | | | | | | | | | | | | | | | | | | | | | | | | (2,409) | | |
Repurchase of class A common stock (in shares) | | | | | | | | (46) | | | | | | | (46) | | | | | | | | | | | | | |
Repurchase of class A common stock | | (9,486) | | | | | | $ (9,486) | | | | | | | | | | | | | | | | (487) | | (8,999) | | |
Ending balance (in shares) at Jun. 30, 2022 | | | | | | | | | | | 0 | | 2 | 3 | 1,637 | | | | 245 | 10 | | | | | | | | |
Ending balance at Jun. 30, 2022 | | 35,483 | | | | | | | 2,851 | | | | $ 936 | $ 1,517 | | | | | | | | | (23) | 18,962 | | 14,960 | | (1,267) |
Beginning balance (in shares) at Mar. 31, 2022 | | | | | | | | | | | 0 | | 2 | 3 | 1,648 | | | | 245 | 10 | | | | | | | | |
Beginning balance at Mar. 31, 2022 | | 35,989 | | | | | | | 2,987 | | | | | | | | | | | | | | (120) | 18,876 | | 14,651 | | (405) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Net income | | 3,411 | | | | | | | | | | | | | | | | | | | | | | | | 3,411 | | |
Other comprehensive income (loss), net of tax | | (862) | | | | | | | | | | | | | | | | | | | | | | | | | | (862) |
Comprehensive income | | 2,549 | | | | | | | | | | | | | | | | | | | | | | | | | | |
VE territory covered losses incurred | | (15) | | | | | | | | | | | | | | | | | | | | | (15) | | | | | |
Recovery through conversion rate adjustment | | 0 | | | | | | | (112) | | | | | | | | | | | | | | 112 | | | | | |
Conversion of stock (for Series A Preferred Stock, less than one million shares) (in shares) | | | | | | | | | | | | 0 | | | | 0 | [1] | 1 | | | 0 | [1] | | | | | | |
Conversion of stock (for Series A Preferred Stock, less than one million shares) | | | $ 0 | $ 0 | | | | | | $ (24) | | | | | | | | | | | | | | | $ 24 | | | |
Share-based compensation, net of forfeitures | | 152 | | | | | | | | | | | | | | | | | | | | | | 152 | | | | |
Vesting of restricted stock and performance-based shares (in shares) | [1] | | | | | | | | | | | | | | 0 | | | | | | | | | | | | | |
Vesting of restricted stock and performance-based shares | | 0 | | | | | | | | | | | | | | | | | | | | | | | | | | |
Restricted stock and performance-based shares settled in cash for taxes (in shares) | [1] | | | | | | | | | | | | | | 0 | | | | | | | | | | | | | |
Restricted stock and performance-based shares settled in cash for taxes | | (1) | | | | | | | | | | | | | | | | | | | | | | (1) | | | | |
Cash proceeds from issuance of class A common stock under employee equity plans (in shares) | [1] | | | | | | | | | | | | | | 0 | | | | | | | | | | | | | |
Cash proceeds from issuance of class A common stock under employee equity plans | | 40 | | | | | | | | | | | | | | | | | | | | | | 40 | | | | |
Cash dividends declared and paid, at a quarterly amount per class A common stock | | (798) | | | | | | | | | | | | | | | | | | | | | | | | (798) | | |
Repurchase of class A common stock (in shares) | | | | | | | | (12) | | | | | | | (12) | | | | | | | | | | | | | |
Repurchase of class A common stock | | (2,433) | | | | | | $ (2,433) | | | | | | | | | | | | | | | | (129) | | (2,304) | | |
Ending balance (in shares) at Jun. 30, 2022 | | | | | | | | | | | 0 | | 2 | 3 | 1,637 | | | | 245 | 10 | | | | | | | | |
Ending balance at Jun. 30, 2022 | | $ 35,483 | | | | | | | $ 2,851 | | | | $ 936 | $ 1,517 | | | | | | | | | $ (23) | $ 18,962 | | $ 14,960 | | $ (1,267) |
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[1]Increase, decrease or balance is less than one million shares. | |